Multi-group primary-secondary-spread crossbar telephone system



N0v 29. 1955 J. l. BELLAMY Erm. 2,725,428

MULTI-GROUP PRIMARY-SECONDARY-SPREAD CROSSBAR TELEPHONE SYSTEM FiledJan. 6, 1953 59 Sheets-Sheet 1 Nov. 29, 1955 J. l. BELLAMY ETAL2,725,428

MULTI-GROUP PRIMARY-SECONDARY-SPREAD CROSSBAR TELEPHONE SYSTEM 59Sheets-Sheet 2 Filed Jan. 6, 1953 Nov. 29, 1955 J. l. BELLAMY ErALMULTI-GROUP PRIMARY-SECONDARY-SPREAD cRossBAR TELEPHONE SYSTEM 59Sheets-Sheet 3 Filed Jan. 6. 1955 n Nhmwl w no og oww o og Y OO .Pv AOvo uovoY AMW .www ovm E ovm N .m @E

INVENTORS JOHN l. BELLAMY l THERON L. BOWERS SYM M17 ATTORNEY mm2] OOOozOOmm J. l. BELLAMY ETAL MULTI-GROUP PRIMARY-SECONDARY-SPREAD Nov. 29,1955 cRossBAR TELEPHONE SYSTEM 59 Sheets-Sheet 4 Filed Jan. 6, 1953 J.l. BELLAMY I'AL MULTI-GROUP PRIMARY-SECONDARY-SPREAD Nov. 29, 1955CROSSBAR TELEPHONE SYSTEM 59 Sheets-Sheet 5 Filed Jan. 6, 1953|NvENToRs= JOHN l. BELLAMY THERoN L. BowERs BY 3 ATTORNEY v m .mi

Nov. 29, 1955 J. l. BELLAMY ETAL MULTI-GROUP PRIMARY-SECONDARY-SPREADCRossBAR TELEPHONE SYSTEM 59 Sheets-Sheet 6 Filed Jan. 6, 1953 um WN YOON n uQPP 'IllOl Nov. 29, 1955 J. l. BELLAMY HAL MULTI-GROUPPRIMARY-SECONDARY-SPREAD CROSSBAR TELEPHONE SYSTEM 59 Sheets-Sheet 7Filed Jan. 6, 1953 J. l. BELLAMY ETAL 2,725,428

CROSSBAR TELEPHONE SYSTEM 59 Sheets-Sheet 8 MULTI-GROUPPRIMARY-SECONDARY-SPREAD Nov. 29, 1955 Filed Jan. 6, 1953 J. l. BELLAMYET AL MULTI-GROUP PRIMARY-SECONDARY-SPREAD Nov. 29, 1955 CROSSBARTELEPHONE SYSTEM 59 Sheets-Sheet 9 Filed Jan. 6, 1953 J. l. BEI-LAMYEVAL MULTI-GROUP PRIMARY-SECONDARY-SPREAD Nov. 29, 1955 CROSSBARTELEPHONE SYSTEM 59 Sheets-Sheet l0 Filed Jan. 6, 1953 Nov. 29, 1955 J.l. BELLAMY Erm. 2,725,428

MULTI-GROUP PRIMARY-SECONDARY-SPREAD cRossBAR TELEPHONE SYSTEM 59Sheets-Sheet l2 J. l. BELLAMY ET AL CROSSBAR TELEPHONE SYSTEM Nov. 29,1955 MULTI-GROUP PRIMARY-SECONDARY-SPREAD Filed Jan. 6, 1953 ONOmCROSSBAR TELEPHONE SYSTEM 59 Sheets-Sheet 15 Filed Jan. 6, 1953 Nov. 29,1955 v J. l. BELLAMY ETI' AL MULTI-GROUP PRIMARY-SECONDARY-SPREADcRossBAR TELEPHONE: SYSTEM 59 Sheets-Sheet 14 Filed Jan. 6, 1953 mmmaHumm s omho...

Nov. 29, 1955 J. l. BELLAMY ETAL 2,725,428

MULTI-GROUP PMMARY-sEcoNnARY-SPREAD cRossBAR TELEPHONE SYSTEM 59Sheets-Sheet 15 Filed Jan. 6, 1953 |NvENToRs= JOHN BELLAMY THERoN l..BowERs syn/w J/LlQ/my ATTORNEY W. 3m w W m f m M TO SECT. PREF RELAYS|200 Nov. 29, 1955 J. l. BELLAMY HAL 2,725,428

MULTI-GROUP PRIMARY-SECONDARY-SPREAD CROSSBAR TELEPHONE SYSTEM FiledJan. 6, 1953 59 Sheets-Sheet 16 TO/ FROM PRI. SW. 3OOAI n? itr m o 0TO/FROM DIGIT RELAYS |500 TO/FROM THOUSANDS CONTROLLER I4OO CH-INCH-ENDJ lNooMlNG THOUSANDS couPLl-:R lloo FROM TRUNK-COUPLER FRAME 252ATTORNEY Nv- 29, 1955 J. l. BELLAMY ETAL MULTI-GROUPPRIMARY-SECONDARY-SPREAD cRossBAR TELEPHONE SYSTEM 59 Sheets-Sheet 17Filed Jan. 6, 1953 |NvENToRs= JoHN|.BELLAMY THERoN L.BowERs $z41z3iua/17ATTORNEY Nov. 29, 1955 J. l. BELLAMY m-AL 2,725,428 MULTI-GROUPPRIMARY-sEcoNDARY-SPREAD cRossBAR TELEPHONE SYSTEM 59 Sheets-Sheet 18Filed Jan. 6, 1953 Nov. 29, 1955 J. l. BELLAMY ETAL MULTI-GROUPPRIMARY-SECONDARY-SPREAD CROSSBAR TELEPHONE SYSTEM 59 SheeliS-Sheell 19Filed Jan. 6, 1953 130m@ 'wom-F200 I OmPZOU -IO Iollr@ Ill- |NVENTORS1JOHN I. BELLAMY THERON L. BOWERS ATTORNEY Nov. 29, 1955 J. 1. BELLAMYErAL 2,725,428

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